#!/usr/bin/env python
# -*- coding:utf-8 -*-
from rest_framework import serializers

from goods.models import SKU


class CartSerializer(serializers.Serializer):
    """购物车数据序列化器"""
    sku_id = serializers.IntegerField(label='sku_id', min_value=1)
    count = serializers.IntegerField(label='数量', min_value=1)
    selected = serializers.BooleanField(label='是否勾选', default=True)

    def validate(self, attrs):
        try:
            sku = SKU.objects.get(id=attrs['sku_id'])
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        if attrs['count'] > sku.stock:
            raise serializers.ValidationError('商品库存不足')

        return attrs


class CartSKUSerializer(serializers.ModelSerializer):
    """购物车商品数据序列化器"""
    count = serializers.IntegerField(label='数量',min_value=1)
    selected = serializers.BooleanField(label='是否勾选')

    class Meta:
        model = SKU
        fields = ('id','count','name','default_image_url','price', 'selected')


class CartDeleteSerializer(serializers.Serializer):
    """
    删除购物车数据序列化器
    """
    sku_id = serializers.IntegerField(label='商品id',min_value=1)

    def validate_sku_id(self, value):
        try:
            sku = SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        return value











